Conversion of acid gas to sulphate or phosphate-based fertilizers

摘要

A method is disclosed for producing sulphate or phosphate-based fertilizer from hydrogen sulphide. The method involves feeding a stream containing a substantial volume of hydrogen sulphide and air to a furnace, where it is burned to produce a sulphur dioxide rich gas stream. The sulphur dioxide rich gas stream is then fed to a reactor to produce a sulphuric acid stream and a waste stream comprising carbon dioxide, nitrogen, oxygen, trace impurities and trace amounts of unreacted sulphur dioxide. The sulphuric acid stream is finally converted to a sulphate or phosphate-based fertilizer.

主权项

1. A method of producing a sulphate or a phosphate-based fertilizer from a feedstock stream comprising hydrogen sulphide in a proportion greater than about 25% by volume and carbon dioxide in an amount no more than about 50% by volume, said method comprising:
a. combusting the feedstock stream in a furnace to produce a stream comprising sulphur dioxide and carbon dioxide; b. feeding the sulphur dioxide stream to a reactor to produce a stream comprising sulphuric acid and a gaseous waste stream comprising carbon dioxide; and c. reacting the sulphuric acid with a potassium source or a phosphate source to convert the sulphuric acid to a phosphate-based or sulphate-based fertilizer.